Cutting tool



A. w. STEN 2,8009% CUTTING TOOL 1 Ju1y23; 1957 Filed March 10, 1955 V INVENTOR. AD LPH \MSTEN ATTO/PA/Ef --acc'ordingly, a feature of my -re ducing the from high grade tool steel ;such tool wears,

United States Patent -My invention -relates to-cutting tools for'boringand reaming apertures,-rnore particularly-to tools which-are arranged to-fiat in a direction transverse ,to the tool holder in order that the tool :-may adjust itself --to any inaccuracy in-the alignment between the tool and the work, and the principal-object-of my inventionis to provide new and improved tools of this type.

-utting tools of the type herein referredto are-necessarilymade of metals which are relatively expensive and, invention is-to provide a adjustable tovarious cutting diameters, thus necessity --of a multiplicity oftools.

oater tool of well-known use is made and is generally of, oblong form with-cutting edges of oposite ends thereof. As 'it requires sharp edges' to be; reground thereon but, of course, the regrinding process reduces the effective diameter of the tool. Some machinists have tool which is The prdinary elongated; the tool by pounding-on-the sidefaces thereof but suchmethod of elongation ispeflfective only to increase the lengthof the tool, a very small amount and is subject to serious-limitations.

Attempts have been made in the prior art to produce acuttingtoolcapable of'being elongated but such attempts have resulted in producing tools, which were not accurate for close tolerance work or tools which were relatively bulky and had only limited applications. My inventionhas solved the problem of-providing a"fioater toolwhich is not materially greater in overall size than the tools made of one-piece tool steel and alsosolved the problem 0t providing'accuracy in an adjustablejfioater tool.

-In the drawing accompanyinggthis specification and forming-a part of this application, there are. shown,-for purposes ofillustration, embodiments which my'invenition-may assume, and in this drawing:

Figure 1 is a separatedperspective view of afioater tool incorporating my invention,

Figure 2 is an enlarged cross-sectional view. of the; tool shown in Figure 1, but in assembled relation,

Figure 3 is a-transverse sectional viewcorresponding generallyto the line '3-3 of'Figure '2,

Figure 4 isa separated perspective iew ofa floater tool showing another embodiment of my invention,

Figure 5 is a perspective view of the tool shown in 'Figure4, looking at the undersurface of the tool, and with parts assembled,

Figure 6 is a transversesectional view corresponding generally to the line 66 of Figure 5, and

Figures 7 and 8 are'fragmentary perspective views of bori g b s which ay b u e ri iconnection with; the improved tool.

Referring particularly to Figures 1 through 3 of the drawings, the embodiment of the invention therein disclosed comprises a pair of cutter bodies 10 and 11 which when combined form the cutting tool 12. Each cutter body, in the present embodiment, is rectangular in cross section, as illustrated in Figures 1 and 2, and has a 2,800,041 Patented July 23, 1957 '2 cutting edge formed-at-an end thereof. Inthe present -case,-e achc fing edge-is provided by an insert'14 of high grade tool steel and-the remainder of the body 'is-m'ade of less expensive steel, although it will be ap- -preciated-that--the entire body may be made of high grade tool steel. 7

Thebody 11- is formed with a longitudinally extending projection-15; which is preferably cy 'ndrical with the exception of alongitudinal flat-16 for a purpose later'to be explained.

(Thebody lll is provided with a longitudinally extending b0re'17 forming a socket which slidably receives the projection 15. Preferably co-axial with the bore 17 is fa-threaded-aperture -18-of less diameter than the bore, theaperture extending from the cutting end of the body '10 to communicationwiththe bottom of the bore 17.

An adjusting screw-19 is threaded into the aperture 18, -the screwhaving a fluted socket 20 at one end for receiving an Allen wrench forthe purpose of rotating the screw. The opposite end of the adjusting screw 19 works into the bore-17 and is engageable with the transverse terminal surface of the projection 15 whereby ro- -tation of-theadjustingscrew 19 in one direction will cause itsoperating end to-bear; against the terminal surface of the pr0jection-15 --and force it in a direction outwardly of 'thebore17. Such action causes longitudinal separation. ofthe cutter bodies 16, 11, to efi'ect elongation ofthe ;cutting tool 12.

A- holding-screw 21 is threaded through a transverse aperture-22 in the body 10, one end of the holding screw eing formed'with a fluted socket toreceive an Allen Wrench and the opposite end working into the bore 17 to engage the fiat 16 on the projection 15. In this manner, the cutter bodies are held in adjusted relation and against relative rotation. As best seen in Figure 3, the axis of the bore 17 is off-set relative to the axis of body 16 (and the projection 15 is similarly off-set with respect tojthe axis of the body 11) so that suflicient wall thickness is provided for the threadedaperture 22 without materially increasing the cross-sectional size of the tool 12.

The cutter bodies may be easily and accurately. adjusted to a predetermined cutting diameter by loosening the holding screw 21 only enough to permit a restricted sliding movement between projection 15 and bore 17. Thus, sufficient drag is produced to hold the cutter bodies in any adjusted position until the .screw 21 is againtightly threaded against the flat 16.

;To increase the cutting diameter of the tool 12 from that shown in Figure 2, the tool may be placed between the anvil and the end of the movable spindle of a micrometer (not shown) with the threaded aperture 18 uncovered by the micrometer parts. Assuming that the micrometer has been set to the required bore diameter, the screw 19 is rotated to separate cutter bodies 10, 11

' until the cutting edges of such bodies engage the spaced measuring parts of the micrometer with required fit. The 'holding'screw may then be securely tightend and the tool 12 is accurately setand ready for use.

The tool 12 may be used with either of the boring bars shown in Figures 7 andS, the bar 25 of Figure7 being preferably used for a straight-through bore whereas the-bar;26 of Figure 8 is adapted for use in floating a blind'hole. The tool- 12 is shown as extending freely through a transverse opening inthe bar 25 so that it may move transversely of' the axisof the bar and align itself with the axis of the bore being floated. It will be appreciated that the tool 12 may be securely fixed to the ba'r 25 andbe used as an ordinary boring tool.

The bar 26 shown in Figure 8 has a slot 27 which opens into its terminal end and this bar is especially adapted for use with tool 12 in floating blind holes. In such use, the tool is disposed within the slot 27 in a 1 1.3 armed qfega P of V screw,

position transverse to the axis of the bar,jas before,

, each having a cutting edge at one end, they opposite Movement of the bar 26 inward of the hole to be floated 2 holds the tool in position. When. the bottom of the hole is rea hed :t ri e a 6 i s 'wit mwn,

maining; within the hole; The tool'may beremoved'from t ej ol like to engage and withdraw the tool l 1; w I Referring ;to Figures .4 through. 6 'of the drawing, the [embodiment of the invention therein'disclosedcomprises each, as before, having a cutting insert 33 at one, end. The terbbdi la r 'butpf opposite hand for complementary Cooperation. As best seen in jFigure 4, the cutter'body 32 has a head portion 34 anda tailportion 35 of lesser transverse size to form a-shoulderportipn36 between it and the head 'p t n-l he h ul e PQI Qf P v ded. generally p allel surfaces-37 and-38 and asurfaee 39 at right angles reliefreees's 40 is formed to the foregoing surfaces. A

the; tool -12 recutter bodies 31' and .32,

inany'suitable manner, as by shifting the work 7 .piece to position' the 'holeivertically with, its opening down- 7 gward, on byreaching into the hole with a wire or the this instance are preferably simil at the intersection of surfaces 38 and 39 for a purpose flatefritotappear. The end'of the tail portion 35 is of.

stepped'tfo'rmation to provide a finger 41.

The cutter body 31is similar to body 32,,but of opiposite hand as before mentioned, and corresponding parts of the bodiesare designated by like reference numerals, V

numerals in the case of the body 31 being supplemented with the sufiix aij The body 31 is formed with an elongated slot 42 extending through the .tail portion 35a whereas the body 32 is formed with a threaded aperture 43 for receiving a headed screw 44, the shank of the and the head of the scrw working through the slot 42 when the latter is drawn tight, holding the bodies against lateral disassembly and in adjusted relation.

.An adjusting screw 45 is threaded through an aperture formed in. the body 3 1, the screw 45 having a socket for receiving an'Allen wrench, As before, the socket is accessible from the cutting end of the body 31.

With the bodies 31, 32 in superimposed relation as 7 shown in Figure 5, the finger 41 of body32 is received within thespace defined by surfaces 38a, 39a, the relief 40a perrnitting the terminal end of finger 41 to move into abutment Wlih surf will beappreciated that finger 41a of cutter body 31-is received within the space defined by surfaces 38, 39 of body 32, as suggested in Figure 4.

f 'The operating end of adjusting screw 45 is adapted to bear against-the transverse terminal surface offoot 41, as clearly shown in Figure 5. Accordingly, when holding screw 44 is backed oif sufficiently to permit restricted relative sliding movement of the cutter bodies 31, 32, the. adjusting screw may be rotated in a direction to cause its operating end to push against foot 41 to separate the bodies and thus cause elongation of the tool 30. When the tool has been adjusted to desired size, the holding screw is tightened to hold the cutter bodies in adjusted relation. 7

In View of the foregoing'it will be apparent to those skilled in theart that l have accomplished at least the V principal object of my invention, and it will also be apparent to those skilled in the art that the embodi-t mentsherein described maybe variously changed and ace 38a without any obstruction. It

receiving said peg-like portion in telescoping manner whereby said cutter bodies may be joined for longitudinal extension and contraction and held in longitudinally aligned relation, saidother cutter .body also having a longitudinally extending aperture.communicating with the inner end of said socket, and an'adjusting screw threadedlyengagingsaid aperture and contacting at its inner end the inner extremity of said peg-like portion of said one body, rotation of said adjusting screw in one direction causing said screw end to push against said peg-like portion and efiect longitudinal extension of said bodies. V V I 2. A cutting tool, comprisinga pair of cutter bodies each having a cutting edge at one end, the opposite end of one body being reduced in transverse section to provide a longitudinally; extending openingat the end opposite receiving said peg-like portion in telescoping manner wherebysaid cutter bodies may be joined for relative longitudinal extension and contraction and held in longijtudina lly aligned'relation, said outer cutter body also having a longitudinally said peg-like port on and effect longitudinal extension of said bodies, and atholding screw threaded into an aperture in said other cutter body, .secting said socket whereby the inner extremity of said holding screw may be tightened against said peg-like porthe latter aperture intertion to hold said cutter bodiesin longitudinally adjusted relation.

3. A cuttingtool, comprising alpair-of-cutter bodies each having a cutting edge at one end, the opposite end of one body being reduced in transverse section to provide a generally cylindrical longitudinally extending porvtion having a longitudinal fiat therein, the other cutter body havingia longitudinally extending cylindrical socket opening at the end opposite its cutting edge for slidably receiving" said cylindrical portion in telescoping manner whereby said cutter bodies may be joined for longitudinal extension, and contraction and held in longitudinally aligned relation, said other cutter body also having a longitudinally extending aperture communicating with the inner end of said socket, an adjusting screw threadedly .engaging said aperture and contacting at its inner end the inner extremity of the cylindrical portion of said one body, rotation of said adjusting screw in one direction causing said screw end to push against said cylindrical portion and eifect longitudinal extension of said bodies, and a holding screw threaded into an aperture in said other cutter body, the latter aperture intersecting said socket whereby'the inner extremity of said holding screw may betightened against the flat in said cylindrical portion 6 hold said, cutter bodies against relative rotation and in longitudinally adjusted relation.

References Cited inthe file of this patent UNITED STATES PATENTSl 1,118,141 i Madison Nov. 24, 1914 2,367,560 Boland Jan. 16,1945

peg-like portion, the other, cutter body having a longitudinally extending socket its cutting edge for slidably t 

